Dr. William Bayer, MD

Dr. William Bayer, MD

Endocrinology, Diabetes & MetabolismMale

Endocrinology, Diabetes & Metabolism

Dr. William Bayer, MD is a Endocrinology, Diabetes & Metabolism Specialist in Bloomingdale, IL. Dr. Bayer has extensive experience in Osteoporosis & Screening, Thyroid Disorders, and Diabetes & Glucose Monitoring. He is affiliated with medical facilities Northwestern Medicine Central DuPage Hospital and Edward Hospital - Main Campus. His office accepts new patients and telehealth appointments.

Locations

Northwestern Medicine Regional Medical Group

Northwestern Medicine Regional Medical Group233 S Gary Ave Bloomingdale, IL 60108
1
New Patient?
(630) 326-4436

Hospital Highlight

Affiliated with Northwestern Medicine Central DuPage Hospital Winfield, a highly rated hospital.

At a Glance

  • Offers Telehealth This provider offers telehealth appointments. Call the office to schedule an appointment.
  • Practices at Top Hospital Outstanding Patient Experience Award™ See hospitals
  • Recent Reviews Reviews made in the last 30 days. See reviews

More Endocrinology, Diabetes & Metabolism Specialists at Northwestern Medicine Regional Medical Group

Dr. Bayer's Reviews

Likelihood to recommend Dr. Bayer

3.5

Based on 33 ratings

5 Stars
60.60606060606061%
(20)
4 Stars
0%
(0)
3 Stars
3.0303030303030303%
(1)
2 Stars
3.0303030303030303%
(1)
1 Star
33.333333333333336%
(11)
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Dr. Bayer
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RecentHighestLowestMost Helpful
Reply
Great Doc
Really explained everything clearly about my thyroid and what steps need to be taken next and always asked if I had any questions.
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
May 06, 2022
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Reply
Horrible bedside manner. Was rude, rushed, constantly cut me off when I tried discussing health concerns. He seemed irritated whenever I asked questions. Focused his attention on his computer to finish the note, versus having eye-contact and a conversation. Instead of explaining the treatment plan directly to me (medications, labs, etc) he read off his thoughts as he was typing it into the note. As someone else said, he sounded very robotic. Did not discuss exercise or nutrition, despite me trying to address that. I plan to change doctors and even clinic if necessary.
What went well
  • Appointment scheduling
  • Staff friendliness
What could be improved
  • Appointment was rushed
  • Didn't listen or answer questions
  • Didn't explain conditions well
1 person found this helpful
Helpful
Mike – Dec 30, 2020
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Reply
Absolutely the best. 20 plus year patient. Dr Bauer and Staff are highly responsive and very comprehensive health care.
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Renee – Dec 15, 2020
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Reply
Dr Bayer is professional and thorough. He asks the right questions and orders all pertinent tests to protect your health. He is always pleasant which is a great complement to being a good doctor.
Helpful
Jan 13, 2020
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Reply
Dr. Bayer is an excellent and outstanding Endocrinologist. I have been seeing him for over 20 years. He's very thorough and explains things to you. He takes his time and listens to you. He's very friendly and he has a great sense of humor. He's the best Endocrinologist around and I would recommend him to anyone!!! ?
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Lisa Robertson in IL – Apr 02, 2019
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Reply
Dr. Bayer has always listened to my symptoms, not just bloodwork results. When the tests he ran came back normal, but my symtpoms said otherwise, he ran more tests until he figured out what was wrong. When my prognosis wasn't great, he personally called me to go over the results and then followed up with a second phone call a week later to see if I had any new questions since our first conversation.
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
2 people found this helpful
Helpful
Bloomingdale – Jan 23, 2018
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Reply
Dr. Bayer is a Diabetic Endocrinologist that I have complete trust in has really turned my A1C Goal/Goals to the Positive. He is very knowledgeable in his field and he always spends appropriate time w/patient/patients. I will be 62 in December and have been battling Diabetes since 1999/2000. He has also been a big influence on how I feel about my condition-always Positive. He has my Thanks! Bryan Compton
What went well
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
2 people found this helpful
Helpful
Bryan Compton in St. Charles IL. – Apr 04, 2017
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Reply
Do not take the bad reviews seriously! Dr. Bayeris amazing & caring! So, if you need a really good doctor that cares about your health & does not set a timer when you walk in, he is your answer to getting your health back on track! I came to him when there was no one else. He cared & I am now on my way to not only answers but resolutions. He has a good heart & is a briliant doctor! If you are serious about working on your health & learning how to be healthier but need a coach; he is for you!
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
3 people found this helpful
Helpful
marge in ELK GROVE VILLAGE – Mar 29, 2017
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Reply
Dr Bayer is a no-nonsense doctor that is very knowledgable and thoruough. I have gone to him for many years before a car accident and am now able to see him again. I could not find his phone number so I looked it up. As I read the reveiws that were positive, I could relate. As I read the negative reviews I wondered what could have gone wrong. I made my appointment a little concerned. Well, I can only say that Dr. Bayer is still the caring wonderful doctor that I remember.
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
2 people found this helpful
Helpful
Hoffman Estates, IL – Mar 29, 2017
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Reply
He needs to retire. He's clearly mad at everything, he was 30 minutes late to an 8:00 am meeting and told me out of the gate he already didn't know what to do. He took no time to listen and understand. he's terrible, go somewhere else
What went well
  • Appointment scheduling
What could be improved
  • Office environment
  • Staff wasn't friendly
  • Long wait times
  • Appointment was rushed
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
2 people found this helpful
Helpful
Vb in Aurora, IL – Feb 25, 2017
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Reply
One of the worst doctors I have ever seen. Rude, disrespectful, and just plain mean. He doesn't care about patients and this was shown by his horrible bedside manner. He needs training on how to be nice to people.
What went well
No results
What could be improved
  • Appointment was rushed
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
3 people found this helpful
Helpful
Wheaton, IL – Feb 17, 2017
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Reply
Dr. Bayer is so nice. He listens and is excited when he sees me progressing in my health. Worked consistently to get my thyroid medication to the appropriate level.
What went well
  • Appointment scheduling
  • Office environment
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
5 people found this helpful
Helpful
Chicago, IL – Oct 18, 2016
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Reply
Rude bedside manner, rushes through, and was annoyed when I had to mention multiple health issues. He really seems to hate his job. Probably competent with thyroid issues but just too rude and unhappy!
What went well
No results
What could be improved
  • Difficult to schedule appointment
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
6 people found this helpful
Helpful
IL – Jun 30, 2016
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Reply
Dr Bayer acted like a robot. Dr Bayer made eye contact 5 seconds during the entire appointment. He spent all his time filling out forms on his computer instead of listening to any concerns I had. His bedside manner is horrible, he is extremely unwilling to entertain other professional opinions. He was very concerned about if insurance will cover instead of the care of the patient, save yourself the frustration find a different doctor who cares about your health & issues.
What went well
  • Wait times
What could be improved
  • Difficult to schedule appointment
  • Office environment
  • Appointment was rushed
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
7 people found this helpful
Helpful
Aurora, IL – Mar 05, 2016
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Reply
Everything I heard about Dr. Bayer from other Doctors and the general public is true. He will take the extra mile on getting to the root of your issues. I felt comfortable with his personality and concern for my health and well being.
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Wait times
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
6 people found this helpful
Helpful
Linda in Aurora, IL – Feb 18, 2016
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Reply
Wouldn't recommend.
What went well
No results
What could be improved
  • Difficult to schedule appointment
  • Staff wasn't friendly
  • Long wait times
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
9 people found this helpful
Helpful
Jan 13, 2016
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Experience and Background Checks

Experience
Background

Background Check

No malpractice claims found for Illinois
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
Learn more about background checks

Frequently Treated by Dr. Bayer

Based on treatment records, we have identified the following as areas of care that Dr. Bayer treats more often than their peers. If you are unsure whether Dr. Bayer treats other conditions, please contact the office at (630) 208-6775.

Osteoporosis & Screening

Osteoporosis specialists diagnose and treat conditions characterized by low bone density and bone weakness, such as osteoporosis and osteopenia.Compare with other Osteoporosis & Screening specialists.

Dr. Bayer is experienced in the area of Osteoporosis & Screening. See the graph below to learn more about his experience.

Based on claims data for 2 conditions and procedures

Treatments
Dr. Bayer
Similar Providers
Osteopenia
Osteoporosis
Normal
Frequency
High
Frequency
Very High
Frequency

Thyroid Disorders

Thyroid disorders specialists diagnose and treat conditions affecting the thyroid gland, including hyperparathyroidism, thyroid disease, and thyroid nodules.Compare with other Thyroid Disorders specialists.

Dr. Bayer is experienced in the area of Thyroid Disorders. See the graph below to learn more about his experience.

Based on claims data for 17 conditions and procedures

Treatments
Dr. Bayer
Similar Providers
Hypothyroidism
Thyroid Goiter
Thyroid Cancer
Goiter
Normal
Frequency
High
Frequency
Very High
Frequency

Diabetes & Glucose Monitoring

Diabetes specialists manage and treat a range of diabetes-related conditions including type 1 and type 2 diabetes and diabetic ketoacidosis through procedures such as continuous glucose monitoring and insulin therapy.Compare with other Diabetes & Glucose Monitoring specialists.

Dr. Bayer is experienced in the area of Diabetes & Glucose Monitoring. See the graph below to learn more about his experience.

Based on claims data for 9 conditions and procedures

Treatments
Dr. Bayer
Similar Providers
Diabetes Type 2
Diabetes Type 1
Diabetes With Renal Manifestations
Diabetes Counseling
Normal
Frequency
High
Frequency
Very High
Frequency

Gonadal Endocrine Disorders

Gonadal endocrine disorders specialists diagnose and treat conditions affecting the reproductive and sex glands, including polycystic ovary syndrome, Turner syndrome, and gynecomastia, most often through hormone replacement therapy.Compare with other Gonadal Endocrine Disorders specialists.

Dr. Bayer is experienced in the area of Gonadal Endocrine Disorders. See the graph below to learn more about his experience.

Based on claims data for 5 conditions and procedures

Treatments
Dr. Bayer
Similar Providers
Testicular Dysfunction
Hypogonadism
Gynecomastia
Normal
Frequency
High
Frequency
Very High
Frequency
Hide other treatment areas

Check Dr. Bayer's experience treating your condition or procedure

Dr. Bayer's conditions and procedures:

  • Abdominal Pain
  • Abnormal Thyroid
  • Acromegaly and Gigantism
  • ACTH (Cosyntropin) Stimulation Test
  • Acute Deep Vein Thrombosis (DVT)
  • Acute Venous Embolism Thrombosis
  • ADHD and-or ADD
  • Adhesive Capsulitis
  • Adrenal Gland Diseases
  • Adrenal Incidentaloma
  • Adrenal Insufficiency
  • All Headaches (incl. Migraine)
  • Allergic Rhinitis
  • Anal or Rectal Pain
  • Anemia
  • Animal Allergies
  • Anxiety
  • Arthritis
  • Arthritis of the Elbow
  • Asthma
  • Asymptomatic Post-Menopausal Status
  • Atherosclerosis
  • Atrophic Vaginitis
  • Autoimmune Thyroid Diseases
  • Back Pain
  • Bedwetting
  • Benign Chronic Pain Syndrome
  • Bladder Infection
  • Blood in Urine (Hematuria)
  • Bronchitis
  • Calcium Metabolism Disorders
  • Candidiasis of Skin and Nails
  • Carpal Tunnel Syndrome
  • Celiac Disease
  • Cellulitis
  • Chest Pain
  • Cholesterol Screening
  • Chronic Fatigue Syndrome
  • Chronic Neck Pain
  • Chronic Pain
  • Chronic Sinusitis
  • Constipation
  • Continuous Glucose Monitoring
  • COPD (Chronic Obstructive Pulmonary Disease)
  • Deep Vein Thrombosis (DVT)
  • Dermatitis
  • Dexamethasone Suppression Test
  • Diabetes Counseling
  • Diabetes Insipidus
  • Diabetes Mellitus, Secondary
  • Diabetes Screening
  • Diabetes Type 1
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diabetic Evaluation
  • Diabetic Ketoacidosis
  • Diabetic Polyneuropathy
  • Diarrhea
  • Difficulty With Walking
  • Diverticulitis, Intestinal
  • Diverticulosis, Intestinal
  • Dynamic Endocrine Function Test
  • Dyslipidemia
  • Emphysema
  • Enlarged Prostate (BPH)
  • Essential Tremor
  • Excessive Sweating
  • Fecal Occult Blood Test for Colorectal Cancer
  • Female Infertility
  • Fever
  • Fibromyalgia
  • Fungal Nail Infection
  • Gait Abnormality
  • Gas-Bloat Syndrome
  • Gastroesophageal Reflux Disease (GERD)
  • Goiter
  • Gout
  • Graves' Disease
  • Growth Hormone Deficiency
  • Gynecomastia
  • Hair Loss
  • Hashimoto's Disease
  • Heart Disease
  • Heart Palpitations
  • Hernia
  • Herpes Zoster Without Complication
  • Hives
  • Human Papillomavirus DNA Testing
  • Hypercalcemia
  • Hyperkalemia
  • Hyperlipidemia
  • Hyperparathyroidism
  • Hypertension
  • Hyperthyroidism
  • Hypoglycemia
  • Hypogonadism
  • Hypokalemia
  • Hypoparathyroidism
  • Hypopituitarism
  • Hyposmolality and Hyponatremia
  • Hypothyroidism
  • Immunization Administration
  • Iron Metabolism Disorders
  • Irritable Bowel Syndrome
  • Joint Pain
  • Leg and Foot Ulcers
  • Limb Cramp
  • Limb Pain
  • Limb Swelling Caused by Fluid Overload
  • Lipedema
  • Lipid Disorders
  • Lipoprotein Disorders
  • Low Back Pain
  • Magnesium Metabolism Disorders
  • Malaise and Fatigue
  • Malnutrition
  • Menopausal and Postmenopausal Disorders
  • Migraine
  • Mineral Metabolism Disorders
  • Multiple Endocrine Neoplasia
  • Noninfectious Gastroenteritis and Colitis
  • Obesity
  • Oral Glucose Tolerance Test
  • Osteoarthritis
  • Osteoarthritis of Ankle and Foot
  • Osteoarthritis of Hand or Wrist
  • Osteoarthritis of Hands
  • Osteoarthritis of Knee
  • Osteoarthritis of Shoulder
  • Osteoarthritis of Spine
  • Osteopenia
  • Osteoporosis
  • Overweight
  • Painful Urination (Dysuria)
  • Parathyroid (Gland) Disease
  • Perimenopause
  • Peripheral Nerve Disorders
  • Plantar Fasciitis
  • Pneumonia
  • Pollen Allergy
  • Polycystic Ovarian Syndrome
  • Polymyalgia Rheumatica (PMR)
  • Polyneuropathy
  • Polyuria
  • Proteinuria
  • Purpura
  • Radiculopathy (Not Due to Disc Displacement)
  • Rash
  • Ringworm
  • Rosacea
  • Sarcoidosis
  • Sciatica (Not Due to Disc Displacement)
  • Shingles
  • Shortness of Breath
  • Shoulder Tendinitis and Tenosynovitis
  • Sinus Tachycardia
  • Sinusitis
  • Sleep Apnea
  • Spermatocele
  • Sprains and Strains (incl. Muscle Tear)
  • Subacute Thyroiditis
  • Symptomatic Menopause
  • Testicular Dysfunction
  • Thyroid Biopsy
  • Thyroid Cancer
  • Thyroid Cyst
  • Thyroid Goiter
  • Thyroid Nodule
  • Thyroid Nodule Evaluation
  • Thyroid Scan
  • Thyroid Screening
  • Thyroiditis
  • Thyrotoxicosis Factitia
  • Tobacco Use Disorder
  • Tremor
  • Trigeminal Neuralgia
  • Ultrasound, Thyroid
  • Urinary Incontinence
  • Urinary Stones
  • Urinary Tract Infection (UTI)
  • Vaginitis and-or Vaginosis
  • VAP Lipid Testing
  • Vertigo
  • Vitamin B Deficiency
  • Vitamin B12 Deficiency
  • Vitamin D Deficiency
  • Water Deprivation Test
  • Wellness Examination
  • Wheezing

Insurance Check

Search for your insurance provider

Dr. Bayer accepts

Accepted insurance can change. Please double-check when making an appointment.

(630) 326-4436

Dr. Bayer accepts the following insurance:

Aetna
Aetna Better Health
Aetna Choice (Aetna HealthFund) POS II
Aetna HMO
Aetna Savings Plus of AZ
Aetna Student Health
Aexcel Choice POS
Aexcel Choice POS II
Aexcel Elect Choice (Open Access) EPO
Choice Plus POS II
Elect Choice
Limited Benefits Insurance Plan PPO
Open Access Aetna Select
Open Access Aetna Select (Aetna HealthFund)
Open Access Elect Choice
Premier Care Network
Select
Traditional Choice
Value Performance Network
Voluntary Group Medical Plan
Anthem
National (BlueCard) PPO
Anthem Blue Cross Blue Shield
Anthem Blue Cross Blue Shield PPO
Beech Street (Multiplan)
Blue Cross Blue Shield
Blue Advantage PPO
Blue Card PPO
Blue Choice PPO
Blue HMO
CareFirst Blue Cross Blue Shield
HealthyBlue 2.0
HealthyBlue Advantage
Cigna
Choice Fund
Choice Fund Open Access Plus
Cigna EPO
Cigna Healthcare of Illinois HMO
Cigna HMO
Cigna POS
Cigna PPO
Global Health Benefits
LocalPlus
Network POS
Open Access
Open Access Plus
Shared Administration
Cofinity
Coventry Health Care
Coventry Health Care of Illinois
Coventry Health Care of Illinois HMO
Coventry Health Care of Illinois POS
Coventry Health Care of Illinois PPO
Health and Life PPO
First Health (Coventry Health Care)
First Health (Coventry Health Care) PPO
Galaxy Health Network
HAP Insurance
Health Alliance PPO
Health Alliance
HealthLink
HealthLink HMO
HealthLink PPO
HealthSmart - Interplan Health Group
Interplan Health Group
HFN
HFN EPO
HFN PPO
Humana
Choice
Choice Care
Choice Care POS
Commercial EPO
EPO PPO Open Access
HCPS Open Access Coverage EPO
HMO Premier HMO
Humana EPO
National POS
National POS – Open Access POS
National Preferred PPO
Imagine Health
MultiPlan
MultiPlan PPO
UnitedHealthCare
Choice
Choice Plus
Choice Plus PPO
Options
Select Plus Gold PPO
Select Plus HMO
Worker's Compensation
Worker's Compensation WC

About Me

Care Philosophy

"Better people means better experiences. Our care team is committed to delivering results that change lives." 

Specialties

  • Endocrinology, Diabetes & Metabolism
  • Internal Medicine

Board Certifications

  • Diabetes, Metabolism & Endocrinology

Education

Loyola University Medical Center
Fellowship Hospital
1989
Loyola Med Ctr
Residency Hospital

Awards

Frequently Asked Questions

How can I make an appointment with Dr. William Bayer, MD?

Click here to schedule an appointment online. New patients can also call (630) 326-4436, and for other questions, call (630) 208-6775.

Does Dr. William Bayer, MD offer telehealth services?

Dr. Bayer has indicated that they offer telehealth. Contact the office to check for eligibility for your needs.

Is Dr. William Bayer, MD accepting new patients?

Dr. William Bayer, MD generally accepts new patients on Healthgrades. You can see Dr. Bayer's profile to make an appointment.

Does Dr. William Bayer, MD accept my insurance?

Use the Healthgrades insurance check to verify if Dr. Bayer accepts your insurance.

What are Dr. William Bayer, MD's top areas of care?

Dr. Bayer frequently treats Osteoporosis & Screening, Thyroid Disorders, and Diabetes & Glucose Monitoring. See all practice areas where Dr. Bayer specializes.

Where is Dr. William Bayer, MD's office located?

Dr. Bayer's office is located at 233 S Gary Ave, Bloomingdale, IL 60108. Find other locations and directions on Healthgrades.

Affiliated Hospitals

Dr. Bayer is affiliated with the following hospitals. Select a hospital below to learn more.

Learn more about how Healthgrades measuresHospital Quality.

Northwestern Medicine Central DuPage Hospital

Winfield, IL

84% Patients that would definitely recommend, 14% higher than the national average

9 Awards Received

Award Highlight: Outstanding Patient Experience Award™ (2021)

Edward Hospital - Main Campus

Naperville, IL

78% Patients that would definitely recommend, 8% higher than the national average

9 Awards Received